Just have them add your server hostname as the MX record at their other host with priority of 10. Once that is done, inform them to set their domain at the other host to "Remote" and that should do it. 4 - 8 hours for propagation of course.

Staff Member

For the question on the account creation, you could select x3mail in the WHM > Account Functions > Create a New Account's Settings "cPanel Theme" dropdown. Choosing x3mail will provide a limited set of account options for an email only account like you are wanting to have.